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3e. (x+y)(3x²+xy+2y²) = 3x³+x²y+2xy²+3x²y+xy²+2y³ = 3x³+2y³+4x²y+3xy²
3f. (3k-5)(k²+2k-6) = 3k³+6k²-18k-5k²-10k+30 = 3k³+k²-28k+30
3g. (a+ab+b)(a-b) = a²-ab+a²b-ab²+ab-b² = a²-b²+a²b-ab²
3h. (x²+3x-5)(x²-2x-1) = -2x³-x²+3x³-6x²-3x-5x²+10x+5 = +x³-12x²+7x+5